EP2505232B1 - Flame retardant sleeve - Google Patents

Description

Technical area

The invention relates to a fire protection sleeve with a jacket made of a fire-resistant material and a strip of intumescent material.

State of the art

Such fire protection cuffs are known in various designs. They serve to close in case of fire breakthroughs through walls, ceilings or floors of buildings, are passed through the flammable or melting pipes, cables or the like. For this purpose, the fire protection sleeve is arranged around the pipes or cables around, so that in a fire, the then expanding intumescent closes the breakthrough as close as possible. In this case, the fire protection sleeve can be arranged either on the outside of the opening, that is, for example, on the wall through which the opening extends, or already directly in the opening, if this has such a diameter that between the pipes or cables and the opening still a sufficient space is available. document US 6,725,615 discloses a fire sleeve known in the art.

As a jacket for the strip of intumescent material usually sheet metal is used. With such a jacket, the swelling pressure of the intumescent material produced in the event of a fire can be well supported, so that it is ensured that the intumescent material expands directed to where the opening is to be closed. A disadvantage of the known constructions, however, is that the sheath is not very flexible and in particular can be cut off only with great effort on site to the desired dimensions.

In addition, a metal jacket prevents the adaptation of the fire sleeve with tight bending radii and tight spaces.

Presentation of the invention

The object of the invention is to provide a fire protection sleeve, which can be used more flexibly and cut to length with little effort on the dimensions required in each case.

To achieve this object, the invention provides that the jacket consists of a flexible mat which is folded over at least one of the longitudinal edges of the intumescent strip so that the mat surrounds the intumescent strip at least on one flat side and one of the two longitudinal edges. The invention is based on the recognition that even with a jacket made of a flexible mat, a sufficient support and directivity can be provided, which reliably determines the direction in which the intumescent strip should expand in the event of fire. The fire protection sleeve can be adapted due to the flexible mat without much effort to the respective conditions on site, and the length of the fire sleeve can be easily adapted on site without much effort that it is cut to the required length.

It is envisaged that the shell has a basis weight of at least 100 g / m ² . In such a material, the necessary strength results in directing the resulting in case of fire inflation pressure of Intumeszenz strip in the desired direction.

The flexible mat may be a fabric or a nonwoven. In both cases, the fire protection sleeve can be cut to length on site with little effort, for example with a pair of scissors, a metal shears or a craft knife.

It is preferably provided that the jacket is folded over both longitudinal edges. This improves the directivity of the shell.

According to one embodiment of the invention, it is provided that the enveloping edge turned over from the longitudinal side to the flat side has a width which is at least equal to half the thickness of the intumescent strip. This width of the enveloping edge ensures that, as the intumescent strip expands, the skirt forms with its edges a channel which dictates the direction of expansion of the intumescent material.

Preferably, the wrap-around edge is not wider than 90% of the width of the intumescent strip. This ensures that the expansion of the Intumescent material in case of fire is not affected by the Umschlagrand.

It is preferably provided that the jacket is attached to the longitudinal edge of the intumescent strip on this. In this way it is prevented that the enveloping edge completely opens when expanding the Intumeszenzmaterials. Instead, the edge of the shell is fixed at an angle of about 90 ° to the flat side of the intumescent strip, so that the shell as a whole forms a channel from which expands the Intumeszenzmaterial out directed.

The jacket can be sewn to the intumescent strip or be connected by brackets with this. It is also possible to connect the jacket by rivets to the intumescent strip.

Preferably, the intumescent strip extends at least 2 mm beyond a line along which the jacket is connected to the intumescent strip. In this way, the jacket is sufficiently firmly connected to the intumescent strip, so that it can not be detached from the jacket at the beginning of the expansion.

The intumescent strip may be extruded onto the jacket. In this way, particularly low manufacturing costs, since the fire sleeve in the form of a continuous, long strip can be manufactured and delivered. Only on site the necessary length of the strip is cut off, which is possible due to the material used for the jacket with little effort.

The intumescent strip can also be made separately from the jacket and then glued to it. This results in very low production costs. Furthermore, it is possible without any problems to cut off the respectively required length of the fire protection sleeve from a continuous long strip, without having to pay attention to a continuous seam. Together with a suitable holder for the Fire protection sleeve can be ensured even with a glued coat that the Intumeszenzdruck acts in the desired direction.

For the jacket of the fire sleeve is preferably used a material which has a temperature resistance up to at least 500 ° C. This ensures that the support function of the jacket is maintained in the event of a fire for a sufficiently long time.

The jacket may in particular contain threads of glass, stone, ceramic and / or metal. In this way, the desired temperature resistance results. According to one embodiment of the invention, a metal strip is inserted between the jacket and the intumescent, which consists for example of a metal foil or a thin metal sheet. In this way, the support effect of the shell can be increased without the cutting of the fire protection sleeve would be considerably more difficult.

• Figur 1 in einer perspektivischen, geschnittenen Ansicht eine Brandschutzmanschette gemäß einer ersten Ausführungsform der Erfindung;
• Figur 2 in einer schematischen Draufsicht eine montierte Brandschutzmanschette;
• die Figuren 3 bis 7 in schematischen Schnittansichten Brandschutzmanschetten, die sich durch die Ausgestaltung des Mantels unterscheiden;
• Figur 8 schematisch die geometrischen Verhältnisse, wenn der Intumeszenz-Streifen aus dem Mantel heraus expandiert;
• Figur 9 in einer schematischen Schnittansicht eine Brandschutzmanschette gemäß einer weiteren Ausführungsform;
• Figur 10 in einer schematischen Ansicht eine Befestigungskralle, mit der die Brandschutzmanschette von Figur 9 befestigt werden kann; und
• Figur 11 in einer schematischen Schnittansicht die Brandschutzmanschette von Figur 8, die mit dem Halter von Figur 9 an einer Rohrdurchführung angebracht ist.

The invention will be described below with reference to various embodiments, which are illustrated in the accompanying drawings. In these show:

• FIG. 1 in a perspective, sectional view of a fire sleeve according to a first embodiment of the invention;
• FIG. 2 in a schematic plan view of a mounted fire sleeve;
• the FIGS. 3 to 7 in schematic sectional views fire protection sleeves, which differ by the design of the shell;
• FIG. 8 schematically the geometric relationships when the intumescent strip expands out of the jacket;
• FIG. 9 in a schematic sectional view of a fire sleeve according to a further embodiment;
• FIG. 10 in a schematic view of a fastening claw, with the fire protection cuff of FIG. 9 can be fixed; and
• FIG. 11 in a schematic sectional view of the fire sleeve of FIG. 8 that with the holder of FIG. 9 attached to a pipe duct.

In FIG. 1 a strip-shaped fire protection sleeve 10 is shown which contains a strip 12 of intumescent material. The intumescent material is a conventional composition containing, for example, polymer-bound active substances such as expanded graphite or ammonium polyphosphates. In the illustrated embodiment, the intumescent strip 12 has a rectangular cross-section with, for example, a width of 50 mm and a thickness of 5 mm.

Around the intumescent strip 12, a sheath 14 is arranged, which consists of a fabric or a non-woven. The jacket may contain threads of glass, stone, ceramic and / or metal. The jacket 14 is temperature resistant up to a temperature of at least 500 ° C. In view of the desired strength, it has a basis weight of at least 100 g / m ² .

As in FIG. 1 can be seen, the jacket 14 extends around a flat side of the intumescent strip 12 around, then around the two narrow longitudinal edges to the other flat side. At the in FIG. 1 In the embodiment shown, the sheath 14 with two narrow enveloping edges 16 extends to the flat side, which is opposite to the completely covered flat side (here: the lower side). Each of the cover edges 16 has a width b which is at least 50% of the thickness d of the intumescent strip. Between the two enveloping edges 16 of the intumescent strip 12 is free.

The intumescent strip 12 can be extruded directly onto the material of the jacket 14 or glued to it. It is also possible in principle to place the intumescent strip 12 loosely on the casing 14 and then to turn over the edges. In any case, the intumescent strip 12 is connected to the jacket 14 by fastening means 18. These are at the in FIG. 1 shown embodiment formed by a seam. For reasons of strength, the stitches have a minimum distance r from the outer edge of the intumescent strip 12 of 2 mm. The same minimum distance s is maintained by the free edge of the Umschlagränder 16. The distance a of the stitches from each other can be between 2 and 25 mm.

Instead of the seam 18, it is also possible to use metal staples which are driven into the intumescent strip 12 at suitable intervals and fix the envelope edge 16 appropriately.

In FIG. 2 the fire protection collar 10 is shown schematically attached to a pipe 30. The fire sleeve 10 is wrapped around the outer periphery of the tube 30 and is fixed there by a plurality of holders 32, which are made of sheet metal and each having a fastening tab 34, with which they can be attached to a wall, a floor or a ceiling, through which Tube 30 is passed. In case of fire, the intumescent expands due to the applied heat, so that it closes the opening through which the tube 30 is passed.

Due to the particularly high flexibility of the fire protection sleeve according to the invention also lines or cables can be wrapped with very small diameter.

In FIG. 3 an alternative embodiment of the jacket 14 is shown. Unlike the in FIG. 1 shown embodiment, the two Umschlagränder 16 are made very wide here. In order not to hinder the expansion of the intumescent strip 12, the width of the cover edges 16 is preferably not more than 90% of the width of the intumescent strip 12.

At the in FIG. 3 In some embodiments, it may be possible to dispense with fastening the enveloping edges 16 on the intumescent strip 12 by means of separate seams or staples. In particular, by gluing the Umschlagränder 16 with the intumescent strip 12, a sufficient directivity can be achieved without seams or staples.

In FIG. 4 an embodiment is shown in which the jacket 14 is wrapped around the intumescent strip 12 asymmetrically.
In the embodiment in FIG. 5 the envelope edge 16 is arranged only on one side. This embodiment can be used in applications in which the intumescent material is otherwise supported on the side on which no Umschlagrand is present, for example, by a wall on which it fits snugly.

At the in FIG. 6 In the embodiment shown, the enveloping edges 16 are double-layered. This leads to a particularly high strength, so that the seam 18 can also be arranged very close to the edge of the Umschlagränder.

At the in FIG. 7 In the embodiment shown, between the jacket 14 and the flat side of the intumescent strip 12, which is completely surrounded by the jacket, a metal strip 40 is arranged, which ensures a higher overall strength of the jacket.

In FIG. 8 schematically illustrates the function of the shell 14, this has in case of fire when the intumescent material expands. The seam 18 holds the envelope edge 16 counter to the pressure acting on the edge of the intumescent strip 12, so that a total of a channel or channel-shaped cross-section of the jacket 14 is obtained, through which the blowing effect is directed away from the side completely surrounded by the shell 14 is (here: up). By suitable design of the seam 18 can be set at the edges of the shell in the broadest sense rectangular cross-sectional shape of the shell. In this way, the jacket 14 exerts a straightening and supporting effect, which is comparable to that of a sheet-metal jacket.

The mechanical strength of the seam 18 must be designed so that the seam resists the resulting swelling pressure. In addition, the seam must have the necessary temperature resistance. In particular, it should remain intact in the same way as the mat up to temperatures of at least 500 ° C. The concrete design of the seam, ie one-, two- or three-thread seams, straight stitches, zigzag stitches, etc. is basically of no importance as long as the seam under the effect of the swelling pressure ensures the desired stabilization of the edge region of the jacket 14.

In FIG. 9 an embodiment is shown in which the jacket 14 is similar to the embodiment according to FIG FIG. 5 only extends around one of the narrow longitudinal edges. In contrast to the embodiment of FIG. 5 the jacket 14 is double-layered on the flat side of the intumescent strip 12, wherein the free end of the jacket is hammered inwards. There is thus no risk that the edge of the jacket 14 frayed.

In this embodiment, the jacket 14 is bonded to the intumescent strip 12 (see the adhesive layer 50 extending over the flat side and one of the narrow longitudinal edges of the intumescent strip 12).

In order to ensure that in the embodiment with glued jacket, the swelling pressure reliably acts in the desired direction, several Holder 32 is used, which are arranged distributed in the circumferential direction around the fire protection collar, as in FIG. 2 shown. The holder 32 (see also FIG. 10 ) consists of sheet metal and has a support portion 35 and an anchoring portion 36. The support portion 35 extends along the outer flat side of the intumescent strip 12 and supports the double-layered jacket 14. The anchoring portion 36 engages around the narrow longitudinal side of the intumescent strip 12 and the Umschlagrand 16. To improve the mechanical support is a mandrel 37 at the free end the anchoring portion 36 is provided which holds the jacket 14 on the intumescent strip 12. Furthermore, mandrels 38 may be provided on the support section 35, which fix the jacket 14 on the flat side of the intumescent strip.

Since the sheath 14 is double-layered on the flat side of the intumescent strip 12, a fabric with a lower basis weight can be used for the sheath. This has the advantage that the fire protection sleeve can be better bent around the pipe or the pipe (s), since the jacket is thinner on the side facing the pipe or lines than on the outer side. Because the jacket, when the fire sleeve 10 is attached to a pipe or a wiring harness, has to be bent or rolled around two different bending edges with different radii, a reduction in the weight per unit area is very positively noticeable. Another advantage of this embodiment is that, due to the lower basis weight, the cost of the fabric is lower. Due to the interaction with the holder 32, however, the necessary stability against the occurring intumescent pressure is ensured even with a "lighter" tissue. The double-layeredness of the jacket 14 thereby increases the tensile strength at the puncture site of the mandrels 38.

The holder 32, in cooperation with the jacket 14, ensures that the inflation pressure acts radially inwards, since the anchoring portion 36, together with the envelope edge 16, prevents or at least severely impedes expansion of the intumescent strip 12 in the axial direction.

The scope of the invention is defined by the appended claims.

Claims (16)

1. Fire protection sleeve (10) made of a casing (14) made of a fire-resistant material and a strip (12) made of intumescent material, in which the casing (14) consists of a flexible mat, which is wrapped around at least one of the longitudinal edges of the intumescent strip (12), so that the casing (14) surrounds the intumescent strip (12) at least on one flat side and one of the two longitudinal edges, characterised in that the flexible mat is a woven fabric or a fleece and has an area weight of at least 100 g/m².
2. Fire protection sleeve according to claim 1, characterised in that the casing (14) is wrapped around both longitudinal edges.
3. Fire protection sleeve according to claim 1 or claim 2, characterised in that the wrapping edge (16) wrapped around the longitudinal edge on the flat side has a width (b), which is at least equal to half the thickness (d) of the intumescent strip (12).
4. Fire protection sleeve according to one of the previous claims, characterised in that the wrapping edge (16) is not wider than 90% of the width of the intumescent strip.
5. Fire protection sleeve according to one of the previous claims, characterised in that the casing (14) is fastened to the intumescent strip (12) along its longitudinal edge.
6. Fire protection sleeve according to claim 5, characterised in that the casing (14) is sewn to the intumescent strip (12).
7. Fire protection sleeve according to claim 5, characterised in that the casing (14) is connected to the intumescent strip (12) with clips.
8. Fire protection sleeve according to claim 5, characterised in that the casing (14) is connected to the intumescent strip (12) with rivets.
9. Fire protection sleeve according to one of claims 5 to 8, characterised in that the intumescent strip (12) extends at least 2 mm beyond a line, along which the casing (14) is connected to the intumescent strip (12).
10. Fire protection sleeve according to one of the previous claims, characterised in that the intumescent strip (12) is extruded on the casing (14).
11. Fire protection sleeve according to one of claims 1 to 9, characterised in that the intumescent strip (12) is stuck to the casing (14).
12. Fire protection sleeve according to claim 11, characterised in that the casing (14) has a double layer on the flat side of the intumescent strip (12).
13. Fire protection sleeve according to one of the previous claims, characterised in that the casing (14) has a heat resistance of at least 500° C.
14. Fire protection sleeve according to one of the previous claims, characterised in that the casing (14) contains threads made of glass, stone, ceramic and/or metal.
15. Fire protection sleeve according to one of the previous claims, characterised in that a metal strip (40) is inserted between the casing (14) and the intumescent strip (12).
16. Fire protection sleeve according to claim 15, characterised in that the metal strip (40) consists of a metal foil or a metal sheet.

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